A stunning combination of sexy, spectacular, and delicious, except in one mind-boggling word. Often used to describe delectable food, but more commonly used as an "OK" sort of word. Common among either extreme nerds, or extremely cool people.
Ryan: Howdy-ho, Jimmie! I'd like to inform you that I'll be heading off to Chess club, so see you later.
Jimmie: That's no problem, Ryan. I'll be heading to the Glee club, anyway...
Ryan: Sextaculicious. Have yourself a satisfactory evening. Cheerio!